Cobweb Backup Services
This is available from version 12.
To back up shared folders or a NAS:
Install Agent for Windows or Agent for Linux on a machine you can access your NAS from.
Create a new backup plan.
Under What to back up select Files/folders:
Click Items to back up:
Select Network share and specify shared folders on your NAS:
Enter your network credentials if prompted
Select other settings and apply the backup plan.